CN115300196A - Middle open-loop developing blood vessel support - Google Patents

Abstract

The application relates to a middle open-loop developing blood vessel stent, which comprises: the support main part, the support main part is including first, second annular bearing structure, first annular bearing structure links to each other in order for a set of first branch head and the tail, the annular structure of constitution, second annular bearing structure is a set of second branch head and the tail are connected in order, the annular structure of constitution, first annular bearing structure's axial length is greater than second annular bearing structure's axial length, the girth of the two equals, first annular bearing structure and second annular bearing structure arrange along its axial is adjacent, form the open loop structure between, and the multistage is first, second annular bearing structure wholly constitutes the tumor neck mouth support segment that is located the tumor mouth position, and be connected to tumor neck mouth support segment distal end respectively, the anchoring vessel section of near-end. By adopting the mode that the large rods and the small rods are arranged in an axial layered mode, the number of adjacent structure connecting points is reduced, the degree of freedom is higher, the compliance of the intravascular stent is improved, the overbending performance is better, and the wall-adhering effect is better.

Description

Middle open-loop developing blood vessel support

Technical Field

The application relates to the technical field of medical equipment, in particular to a middle open-loop developing intravascular stent.

Background

The common operation strategy is to establish a passage, then deliver devices such as a stent or a spring ring to a lesion part, push out the stent or the spring ring, block the lesion vascular aneurysm and complete the operation.

The auxiliary support auxiliary spring ring embolism treatment is a common treatment mode, the treatment mode has high requirements on a support, the support needs to have sufficient compliance and good adherence performance, and the support also needs to be visible under X-rays, so that an operator can conveniently judge the opening state of the support.

However, in the prior art, the intravascular stent cannot have a higher development area on the basis of considering that the stent has enough compliance and good adherence performance, so that an operator can observe specific conditions from the outside of a patient body conveniently.

Disclosure of Invention

In view of the above, the present application proposes a middle open-loop developing blood vessel stent, comprising a stent main body; the stent body comprises a first annular support structure and a second annular support structure; the first annular supporting structure is an annular structure formed by sequentially connecting a group of first supporting rods end to end; the second annular supporting structure is an annular structure formed by sequentially connecting a group of second supporting rods end to end; the axial length of the first annular support structure is greater than that of the second annular support structure, the circumferences of the first annular support structure and the second annular support structure are equal, and the first annular support structure and the second annular support structure are arranged adjacently along the axial direction of the first annular support structure and the second annular support structure to form an open-loop structure; the multiple sections of the first annular supporting structures and the multiple sections of the second annular supporting structures integrally form a tumor neck opening supporting section located at a tumor opening position, and anchoring blood vessel sections respectively connected to the far end and the near end of the tumor neck opening supporting section; a developing section is arranged between the tumor neck opening supporting section and the anchoring blood vessel section;

the development section is two first annular bearing structure links to each other and constitutes, and two have a plurality of tie points of connecting the two and a plurality of middle part development installation department between the first annular bearing structure, the development main part sets up on the middle part development installation department.

In one possible implementation, the ratio of the number of a set of said first struts to the number of a set of said second struts is 2: 3.

In one possible implementation manner, the connecting point and the middle developing mounting part are arranged adjacent to each other in the circumferential direction of the developing section; the developing main body is arranged on the middle developing installation part.

In one possible implementation, the middle developing installation part is of a straight rod-shaped structure, and the middle developing installation part is arranged in parallel with the axial direction of the support main body.

In one possible implementation manner, one end of the middle developing mounting part is a fixed end and is connected to the first annular supporting structure on one side, and the other end of the middle developing mounting part is a free end and is not in contact with the first annular supporting structure on the other side; the middle developing installation parts which are arranged at intervals are fixed to the first annular supporting structure on the same side; or alternately set up the middle part is developed the installation department and is fixed to being located the heterolateral on the first annular bearing structure, the development main part is in the axial dislocation set of development section.

In a possible implementation, the stiff end of middle part development installation department is fixed extremely first annular bearing structure, adjacent opposite side one side of first annular bearing structure, just middle part development installation department is connected to the nodical position of first bracing piece end to end.

In one possible implementation manner, the middle developing mounting parts are symmetrically arranged on the two first annular supporting structures, and a mounting gap is formed between the two opposite middle developing mounting parts; the middle developing installation part is connected to the intersection point position of the first supporting rod in end-to-end connection; the developing main body is arranged on the middle developing installation part in a penetrating mode and is arranged oppositely.

In one possible implementation, the visualization body is a radiopaque spring or metal ring, 4 in number, uniformly arranged in the circumferential direction of the visualization section.

In a possible implementation manner, two adjacent second annular supporting structures are connected to form a closed loop structure, and the end, which is not connected with the tumor neck support section, of at least one anchoring blood vessel section is provided with the closed loop structure.

In one possible implementation, the neck support section has a length in its axial direction of [4mm,10mm ].

In one possible implementation, the sum of the first annular support structure and the second annular support structure within the neck support section is an odd number of segments.

In one possible implementation, the sum of the first annular support structure and the second annular support structure within the neck support section is 3 or 5 segments.

In one possible implementation, the first strut is a straight rod structure, and the straight length of the first strut is within [1.2mm-2.5mm ].

In one possible implementation, the included angle between two adjacent first struts in the same group is within [40 ° -100 ° ].

In one possible implementation manner, the second supporting rod is of a straight rod structure, and the length of the straight line of the second supporting rod is within [0.7mm-2mm ].

In a possible realization, the included angle between two adjacent second struts in the same group is within [35 °,90 ° ].

In one possible implementation, the stent body has a shrinkage rate of between 6% and 15%.

In a possible implementation manner, the two ends of the stent main body are provided with flaring structures, and the included angle formed by the flaring structures and the axial direction of the stent main body is within [30 degrees, 60 degrees ].

In a possible implementation mode, the anchoring blood vessel section is far away from one end of the neck opening supporting section is outwards provided with an end part developing installation part, the developing main body is arranged on the end part developing installation part

The beneficial effect of this application: through arranging the first annular bearing structure of multistage and multistage second annular bearing structure along its axial is adjacent, constitute the support main part, and the axial length of first branch is greater than the axial length of second branch, adopt the mode that big or small pole was arranged at axial layering, form the ring-opening structure between adjacent first annular bearing structure and second annular bearing structure, partial tie point is because first branch and the dislocation set that second branch axial length varies, the quantity of tie point on the adjacent section structure has been reduced, when making the development vascular support of middle part open-loop of this application have sufficient radial support performance in the blood vessel, the degree of freedom is higher, it is reasonable, this vascular support's compliance has been improved to effectual, it is more excellent to cross the bending performance, and vascular support's toughness is better, thereby make the effect of the attached intravascular wall of this vascular support better.

Moreover, the reduced partial connecting points enable the stent to have larger compression amount and toughness, when the stent is not released to a target position in a patient body, the middle open-loop development blood vessel stent is positioned in the guide sheath, has smaller volume when in a compressed state, and is convenient to convey to a target tissue in the patient body.

Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

FIG. 1 is a schematic diagram showing a planar development structure of a middle open-loop blood vessel stent of a one-end open-loop structure and a one-end closed-loop structure according to an embodiment of the present application;

FIG. 2 is a schematic plan view showing a developed configuration of a middle open-loop stent having two closed-loop structures at two ends according to an embodiment of the present application;

FIG. 3 is a schematic diagram showing a planar deployment structure of a middle open-loop visualization vessel stent with closed loops at two ends according to another embodiment of the present application;

FIG. 4 is a side view of an open-loop central visualization stent of an embodiment of the present application;

FIG. 5 shows a schematic view of a mid-open loop of a stented vessel released at a location corresponding to an aneurysm according to an embodiment of the present application;

FIG. 6 is a schematic view showing a connection relationship in which a middle developing mount portion of the embodiment of the present application is fixed to a developing section;

FIG. 7 is a schematic structural view showing a developing section of an embodiment of the present application;

FIG. 8 shows a schematic view of a mid-open loop of a stented stent delivered at a location corresponding to an aneurysm according to another embodiment of the present application.

Detailed Description

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

It will be understood, however, that the terms "central," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present application or for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present application.

FIG. 1 is a schematic diagram showing a planar expanded structure of a middle open-loop, one-end closed-loop stent according to an embodiment of the present application; FIG. 2 is a schematic plan view showing a developed configuration of a middle open-loop stent having two closed-loop structures at two ends according to an embodiment of the present application; FIG. 3 is a schematic diagram showing the planar development structure of a middle open-loop visualization blood vessel stent with closed loops at two ends according to another embodiment of the present application; FIG. 4 is a side view of an open-loop central developable vascular stent according to an embodiment of the present application; FIG. 5 shows a schematic view of a mid-open loop of a stented vessel released at a location corresponding to an aneurysm according to an embodiment of the present application; FIG. 6 is a schematic view showing a connection relationship in which the middle developing mount portion is fixed to the developing section in the embodiment of the present application; FIG. 7 is a schematic structural view showing a developing section of an embodiment of the present application; FIG. 8 shows a schematic view of a mid-open loop of a stented vessel released at a location corresponding to an aneurysm according to another embodiment of the present application.

As shown in fig. 1-8, the middle open-loop stent for visualizing comprises: the support main part, the support main part includes first annular bearing structure 10 and second annular bearing structure 20, first annular bearing structure 10 is a set of first branch 100 end to end in order, the annular structure of constituteing, second annular bearing structure 20 is a set of second branch 200 end to end in order and connects, the annular structure of constitution, the axial length of first annular bearing structure 10 is greater than the axial length of second annular bearing structure 20, and the girth of the two equals, first annular bearing structure 10 and second annular bearing structure 20 arrange along its axial is adjacent, form open loop structure 30 between, and first annular bearing structure 10 of multistage and second annular bearing structure 20 whole constitution are located the tumor neck mouth support segment 1 of tumor mouth position, and be connected to tumor neck mouth support segment 1 distal end respectively, the anchoring vessel section 3 of near-end.

In this embodiment, through arranging the first annular bearing structure 10 of multistage and the adjacent annular bearing structure 20 of multistage along its axial, constitute the support main part, and the axial length of first branch 100 is greater than the axial length of second branch 200, adopt the mode that big or small pole was arranged at axial layering, form open loop structure 30 between adjacent first annular bearing structure 10 and second annular bearing structure 20, partial tie point is because first branch 100 and second branch 200 axial length are unequal dislocation set, the quantity of the structural tie point of adjacent section has been reduced, so that the development intravascular stent of middle part open loop of this application has when sufficient radial support performance in the blood vessel, the degree of freedom is higher, it is reasonable, this intravascular stent's compliance has effectively been improved, the overbending performance is more excellent, and intravascular stent's toughness is better, thereby make this intravascular stent's attached intravascular wall's effect better.

Moreover, the partial tie point that reduces makes this support have great compression capacity and toughness, when not releasing to the internal target location of illness, ensures that the development blood vessel support of middle part open-loop of this application is located leading-in sheath, has less volume when being in the compression state, is convenient for carry to the internal target tissue department of illness.

Further, first annular bearing structure 10 that first branch 100 connects the constitution end to end in order, with second annular bearing structure 20 that second branch 200 end to end in order, the two is adjacent arranging along its axial, the connected mode of this arranging is: the intersection points on the first struts 100 connected end to end and the intersection points on the second struts 200 connected end to end are only partially connected with each other, and the rest parts are not connected to the adjacent annular supporting structures.

It should be particularly emphasized that, the lengths of the anchoring vessel segments 3 at the distal end and the anchoring vessel segments 3 at the proximal end may be the same or different, and the practitioner in the art needs to ensure that the tumor body 4 is located, for example, the tumor body 4 has a side branch vessel 6 at the side, and the anchoring vessel segments 3 at this side need to be further extended to completely cross the side branch vessel 6 to provide a supporting function for the entire vessel stent, and the extension segments also are sequentially arranged in the axially adjacent connection manner of the first annular supporting structure 10 and the second annular supporting structure 20 until the anchoring vessel segments can be extended to the position of the inner wall of the vessel without the side branch vessel 6, so as to ensure that the anchoring vessel segments 3 at this end can stably provide the support, so as to the length of the anchoring vessel segments 3, the practitioner in the art can self-determine the respective lengths of the anchoring vessel segments 3 at the distal end and the proximal end of the cervical os supporting segment 1 according to the specific surgical situation.

Further, the open loop structure 30 referred to in this application is: after the first annular support structure 10 and the second annular support structure 20 are axially connected, only a part of the points where the two are connected end to end are connected with each other, and the other parts of the points are not connected with the whole structure of the adjacent annular support structures. The closed loop structure 40 referred to in this application is: after two adjacent second annular support structures 20 are axially connected, the intersection points between the two second annular support structures 20 completely correspond to each other, and are connected to each other.

In one embodiment, the ratio of the number of the first struts 100 to the number of the second struts 200 is 2: 3.

In this embodiment, the number of the set of first struts 100 and the number of the set of second struts 200 is 2:3, i.e. every four first struts 100 connected end to end, corresponding to six second struts 200 connected end to end.

Preferably, the number of the first struts 100 is 16, the number of the second struts 200 is 24, and the stent body formed by the number of the first struts and the second struts is reasonable in structural strength on the premise that the number of the struts on the stent body is appropriate and the stent body can adapt to the inner diameter of most blood vessels.

More specifically, the number of the first struts 100 is 16, the number of the second struts 200 is 24, and there are only four connection points between the first annular support structure 10 and the second annular support structure 20, compared with the conventional arrangement mode in which the first struts 100 and the second struts 200 are arranged at equal lengths and all the connection points are in one-to-one correspondence, the compliance and adherence of the middle open-loop blood vessel stent of the present application are sufficiently improved while the middle open-loop blood vessel stent of the present application has good radial support performance.

Further, the tumor neck support section 1 adopts the design that the length of the first strut 100 is greater than the length of the second strut 200, and the first annular support structure 10 and the second annular support structure 20 are arranged in a staggered manner in the axial direction, so that when the intravascular stent is in a compressed state, the radial volume of the stent can be reduced, and the pushing resistance generated by an operator in the field during pushing is reduced.

In one embodiment, two adjacent second annular support structures 20 are connected to form a closed loop structure 40, and the end of at least one anchoring vessel section 3 not connected to the tumor neck support section 1 has the closed loop structure 40.

In this embodiment, the end of the at least one anchoring vessel section 3 not connected to the tumor neck support section 1 has a closed loop structure 40, i.e. the end of the stent body has this closed loop structure 40 at one of its ends, and usually this closed loop structure 40 is disposed at the distal end of the stent body, so that it is easy for the practitioner to perform an integral compression of the stent body and to feed it from the distal end of the stent body into the introducer sheath.

In one embodiment, the developing section 2 is provided between the neck support section 1 and the anchoring blood vessel section 3, the developing section 2 is formed by connecting two first annular support structures 10, and a plurality of connection points and a plurality of middle developing installation parts 300 are provided between the two first annular support structures 10, the connection points and the middle developing installation parts 300 are arranged adjacent to each other in the circumferential direction of the developing section 2, the developing body 500 is a radiopaque spring ring or a metal ring, and is arranged on the middle developing installation part 300.

In this embodiment, add the development section 2 between tumour neck mouth support section 1 and anchoring blood vessel section 3, the setting position of development section 2 is easily followed the near-end of tumour neck mouth and the state of distal end observation sick body periphery and tumour neck mouth position, and more do benefit to the more clear real-time condition in the judgement operation of art person, the cooperation is led into the sheath and is passed through tumour neck mouth distal end to the development blood vessel support of the middle part open loop of this application, near-end two places are developed, carry and carry out the original place release to this blood vessel support after targetting in place, original place release means tumour neck mouth support section 1 just in time corresponds tumour neck mouth on the blood vessel axial opening position.

It should be noted here that the connection point referred to in this application is an intersection point where the first lever 100 is connected end to end, and the mounting point of the middle developing mount 300 referred to in this application is also an intersection point where the first lever 100 is connected end to end.

More specifically, the developing section 2 is specifically: two adjacent segments of the first annular support structures 10 are connected in the axial direction, and two different structures are arranged between the adjacent first annular support structures 10:

the first is a connection point where the intersection points of the two first annular support structures 10 are directly connected;

second, the middle developing mount 300 to mount the developing main body 500 thereon;

that is, the connection point is disposed adjacent to the developing body 500 in the circumferential direction between the two first ring structures, so that it has a large developing area and still has a good structural strength.

In one embodiment, the middle developing mount 300 has a straight rod-shaped structure, and the middle developing mount 300 is disposed parallel to the axial direction of the holder body.

In this embodiment, the middle developing mounting portion 300 is a solid straight rod structure, and may be a solid rod structure, and the developing main body 500 is sleeved and fixed on the middle developing mounting portion 300. The middle developing mount 300 is parallel to the axial direction of the main body of the stent so that the operator can observe the maximum developing area from the outside of the body.

In one embodiment, the middle developing installation part 300 may be a hollow rod structure with a groove and a hollow groove therein, and after the developing main body 500 is sleeved and fixed on the middle developing installation part 300, the developing main body 500 may be further pressed into the groove of the middle developing installation part 300 through processing, so as to increase the contact area between the developing main body 500 and the middle developing installation part 300, thereby improving the connection strength therebetween.

In one embodiment, the main body 500 is a coil or ring of radiopaque material that can be laser welded or glued to the middle developer mounting portion 300 after being fixed to the middle developer mounting portion 300.

In one embodiment, the middle developing mount 300 has one end as a fixed end connected to the first ring-shaped support structure 10 on one side and the other end as a free end not contacting the first ring-shaped support structure 10 on the other side.

More specifically, in one of the embodiments, the intermediate developing mounts 300 disposed alternately are fixed to the first ring-shaped support structure 10 on the same side.

In this embodiment, one end of the middle developing mounting part 300 is connected to the first annular supporting structure 10 on one side as a fixed end, and the other end is a free end, and the middle developing mounting part 300 is not in contact with the first annular supporting structure 10 on this side, so that a person skilled in the art can fix the developing main body 500 on the middle developing mounting part 300 in a sleeving manner during processing.

In one embodiment, the middle developing mounts 300 are fixed to the first ring-shaped supporting structure 10 on the opposite side, and the developing bodies 500 are arranged offset in the axial direction of the developing section 2.

In this embodiment, the middle part that is located the unilateral setting develops installation portion 300, after installation development main part 500, development main part 500 is at the axial of development section 2 alternately, and the dislocation set, the abundant improvement the development area, after the release of support main part, the vascular stent of the ring-opening of being convenient for observe this application is in opening and adherence state of tumour footpath mouth to make the adjustment operation that the operative person can be better.

In summary, the intermediate developing mounts 300 referred to herein disposed at intervals are: a tie point setting of looks interval between two middle part development installation departments 300, these two middle part development installation departments 300 can be fixed to being located the first annular bearing structure 10 with one side, also can be located the first annular bearing structure 10 of heteropleural, compare in fixed middle part development installation department 300 to the homonymy, the development area that can observe obtains promoting to the inside condition of the more clear observation sick body of art person.

In one embodiment, the fixed end of the middle developing mount 300 is fixed to one side of the first ring-shaped support structure 10 adjacent to the other side of the first ring-shaped support structure 10, and the middle developing mount 300 is connected to the first rod 100 at the intersection point where the first rod ends.

In this embodiment, the length of the two first bars 100 provided with the developing mount on the developing stage 2 is smaller than the length of the two first bars 100 intersecting to form the connecting point, providing a larger space for the middle developing mount 300 having a bar shape, and providing a more sufficient mounting space for the practitioner in the art to mount the developing body 500.

In one embodiment, the middle developing mounting parts 300 are symmetrically disposed on the two first ring-shaped supporting structures 10, a mounting gap is formed between the two opposite middle developing mounting parts 300, the middle developing mounting parts 300 are connected to the intersection point of the first supporting rod 100 in an end-to-end manner, and the developing body 500 is inserted through the two middle developing mounting parts 300 which are oppositely disposed.

In this embodiment, the middle developing mounts 300 are symmetrically disposed in the radial direction of the stent on the two first ring-shaped supporting structures 10, and the two middle developing mounts 300 are symmetrically disposed with a mounting gap therebetween, which facilitates the installation of the developing body 500 by the practitioner in the field, and this symmetrical arrangement increases the developing length in the axial direction of the stent to be twice as long as the length of the middle developing mount 300 disposed on one side.

In one of the specific embodiments, the number of the developing main bodies 500 in the circumferential direction of the developing stage 2 is 4.

In this embodiment, preferably, the 4 developing main bodies 500 are uniformly arranged in the circumferential direction of the developing section 2, that is, the included angle between the two adjacent developing main bodies 500 and the connecting line of the axis of the blood vessel stent is 90 °.

In one embodiment, the neck support section 1 is within [4mm,10mm ] of its axial length.

In this embodiment, the length of the tumor neck support section 1 should be matched with the neck length of the tumor neck, so as to effectively support the tumor neck.

Preferably, the neck support section 1 with the axial length of the blood vessel support being [4mm,10mm ] can adapt to the tumor body 4 in most cases and can play an effective supporting role.

In one embodiment, the first support bar 100 is a straight bar structure, and the length of the straight line of the first support bar 100 is within 1.2mm-2.5 mm.

In one embodiment, the included angle between two adjacent first struts 100 in the same group is within [40 ° -100 ° ].

In one embodiment, the second bar 200 is a straight bar structure, and the length of the straight line of the second bar 200 is within 0.7mm-2 mm.

In one embodiment, the angle between two adjacent second struts 200 in the same set is within [35 °,90 ° ].

In the above embodiment, the included angle between two adjacent first struts 100 in the same group and the included angle between two adjacent second struts 200 in the same group are mainly for adapting to blood vessels with different thicknesses, and under the condition of ensuring that the circumferential lengths are equal, the smaller the included angle between two adjacent first struts 100 which are connected end to end is, the smaller the stent diameter is, the larger the included angle between two adjacent struts is, and the larger the stent diameter is. The same applies to the adjacent and end-to-end connected second struts 200, and the diameter of the stent can be realized by the way of expanding and heat setting after the same tube is cut, and the prior art can be directly adopted, so that further details are not given herein.

In one embodiment, the stent body has a foreshortening rate of between 6% and 15%.

In this embodiment, the short shrinkage of the stent body means that the axial compression amount of the open-loop middle portion of the stent in the compressed state from the normal state to the introduced sheath is between 6% and 15% of the axial length of the stent body under the normal state.

In one embodiment, the stent body has flared structures 600 at both ends, and the angle between the flared structures 600 and the axial direction of the stent body is within [30 °,60 ° ].

In this embodiment, the flaring structure 600 is disposed, before the stent is released, and when the stent is in a compressed state, the flaring structure 600 extends into the guiding sheath in a parallel manner, so that the flaring structure 600 is close to the end of the stent released, which is more favorable for anchoring the end of the blood vessel section 3 far away from the tumor neck opening supporting section 1, and is more stably and firmly anchored on the inner wall of the blood vessel.

In one embodiment, an end of the anchoring vessel section 3 away from the cervical support section 1 is provided with an end visualization mounting part 400, and the visualization body 500 is arranged on the end visualization mounting part 400.

In this embodiment, the one end of anchoring blood vessel section 3 that keeps away from tumour neck mouth support section 1 is provided with tip development installation department 400 outwards, it needs to point out here, the structure of tip development installation department 400 can be the same with middle part development installation structure completely, only set up the position difference, also can develop the structure of installation department 300 with the middle part slightly differently, only need ensure to stabilize on it, firm cover establishes development main part 500, the one end of keeping away from tumour neck mouth support section 1 that realizes anchoring blood vessel section 3 also has development main part 500, so that the position at the development vascular support both ends of the open-loop in middle part of this application is observed from the disease external portion, judge whether vascular support's both ends can be in the both sides of tumour body 4, respectively the anchoring can at the blood vessel inner wall, do not do more specifically and prescribe.

In one embodiment, the sum of the first and second annular support structures 10, 20 within the neck support section 1 is an odd number.

In one embodiment, the sum of the first and second annular support structures 10, 20 within the neck support section 1 is 3 or 5 segments.

In this embodiment, it is preferable that the total number of the first annular support structure 10 and the second annular support structure 20 in the tumor diameter port support section is 3 or 5, and the middle two groups of developing sections 2 are respectively located at the proximal end and the distal end of the tumor diameter port after the vascular stent is released. The combination mode of the middle 3 sections is suitable for the tumor 4 with the tumor diameter opening of 4-6mm, and the combination of the middle 5 sections is suitable for the tumor 4 with the tumor diameter opening of 6-10 mm. The combination mode of the large rods and the small rods of the first supporting rod 100 and the second supporting rod 200 has the advantages that the structural density of the tumor neck opening supporting section 1 is higher than the mesh density of the near-end and far-end developing areas, and the spring ring in the tumor body 4 is better supported.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or improvements to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (19)

1. The middle open-loop developing blood vessel stent is characterized by comprising a stent main body;

the stent body comprises a first annular support structure and a second annular support structure;

the first annular supporting structure is an annular structure formed by sequentially connecting a group of first supporting rods end to end;

the second annular supporting structure is an annular structure formed by sequentially connecting a group of second supporting rods end to end;

the axial length of the first annular supporting structure is greater than that of the second annular supporting structure, the circumferences of the first annular supporting structure and the second annular supporting structure are equal, the first annular supporting structure and the second annular supporting structure are arranged adjacently along the axial direction of the first annular supporting structure and the second annular supporting structure, and an open-loop structure is formed between the first annular supporting structure and the second annular supporting structure;

the first annular supporting structures and the second annular supporting structures integrally form a tumor neck opening supporting section located at a tumor opening position and anchoring blood vessel sections connected to the far end and the near end of the tumor neck opening supporting section respectively;

a developing section is arranged between the tumor neck opening supporting section and the anchoring blood vessel section;

the developing section is formed by connecting two first annular supporting structures, and a plurality of connecting points for connecting the two first annular supporting structures and a plurality of middle developing installation parts are arranged between the two first annular supporting structures;

the developing body is disposed on the middle developing mounting portion.

2. The mid-open loop visualized vascular stent of claim 1 wherein the ratio of the number of a set of said first struts to the number of a set of said second struts is 2: 3.

3. The middle open-loop blood vessel stent of claim 1, wherein the connection point is disposed adjacent to the middle visualization mounting portion in a circumferential direction of the visualization section.

4. The middle ring-opened blood vessel stent for visualization according to claim 1, wherein the middle portion visualization installing portion is a straight rod-shaped structure, and the middle portion visualization installing portion and the stent main body are arranged in parallel to each other in the axial direction.

5. The middle open-loop visualization blood vessel stent of claim 3, wherein the middle visualization mounting part has one end being a fixed end connected to the first annular support structure on one side and the other end being a free end not contacting the first annular support structure on the other side;

the middle developing installation parts are alternately arranged and fixed on the first annular supporting structure on the same side; or the middle developing installation part is arranged at intervals and fixed to the first annular supporting structure positioned at the opposite side, and the developing main body is arranged in the axial direction of the developing section in a staggered mode.

6. The middle ring-opened blood vessel stent for visualization of claim 5, wherein the fixed end of the middle developing installation part is fixed to one side of the first annular supporting structure adjacent to the other side of the first annular supporting structure, and the middle developing installation part is connected to the intersection point position of the first strut in end-to-end connection.

7. The middle open-loop visualization blood vessel stent of claim 3 wherein the middle visualization mounting portions are symmetrically disposed on two of the first annular support structures with a mounting gap between the two opposing middle visualization mounting portions;

the middle developing installation part is connected to the intersection point position of the first supporting rod in end-to-end connection;

the developing main body is arranged on the middle developing installation part in a penetrating mode and is arranged on the two opposite developing installation parts.

8. The mid-open loop developable vascular stent of claim 3, where the developable bodies are radiopaque coils or metal rings, 4 in number, and are uniformly deployed in the circumferential direction of the developable section.

9. The mid-open loop visualized vascular stent according to any one of claims 1-8, wherein two adjacent second annular support structures are connected to form a closed loop structure, and the closed loop structure is provided at the end of at least one of the anchoring vessel segments that is not connected to the tumor neck support segment.

10. The mid-open loop expandable stent according to any one of claims 1 to 8, wherein the length of the neck support section in its axial direction is within [4mm,10mm ].

11. The mid-open loop visualization stent of claim 10 wherein the sum of the first and second annular support structures within the neck support section is an odd-numbered segment.

12. The mid-open loop visualizable vascular stent of claim 10, wherein the sum of the first annular support structure and the second annular support structure within the neck support section is 3 or 5 segments.

13. The mid-open loop imaging stent according to any one of claims 1 to 8, wherein the first struts have a straight rod structure, and the straight length of the first struts is within [1.2mm-2.5mm ].

14. The mid-open loop imaging stent according to any one of claims 1 to 8, wherein the included angle between two adjacent first struts in the same group is within [40 ° -100 ° ].

15. The mid-open loop imaging stent according to any one of claims 1 to 8, wherein the second struts have a straight rod structure, and the straight length of the second struts is within [0.7mm-2mm ].

16. The mid-open loop imaging stent according to any one of claims 1 to 8, wherein the included angle between two adjacent second struts in the same group is within [35 °,90 ° ].

17. The mid-open loop visualized blood vessel stent according to any one of claims 1-8, wherein the foreshortening rate of the stent body is between 6% and 15%.

18. The middle open-loop developing blood vessel stent of any one of claims 1 to 8, wherein the two ends of the stent main body are provided with flaring structures, and the included angle formed by the flaring structures and the axial direction of the stent main body is within [30 degrees, 60 degrees ].

19. The middle open-loop blood vessel developing bracket according to any one of claims 1 to 8, characterized in that one end of the anchoring blood vessel section, which is far away from the neck support section, is provided with an end developing installation part outwards, and the developing body is arranged on the end developing installation part.

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